Adaptive Immunity

An antigen is __________.

• a protein that presents information to T cells

• a protein that identifies and neutralizes foreign substances

• a molecule that stimulates an immune response

• an organism that causes disease in its host

The adaptive immune system is able to discriminate between harmless host antigens and dangerous foreign antigens. This property is called __________.

• tolerance

• specificity

• diversity

• memory

Which immune response is a branch of the adaptive immune system and protects extracellular fluids like lymph and blood?

• Passive immunity

• Humoral immunity

• Cellular immunity

• Innate immunity

Which immune response is a branch of the adaptive immune system and protects the body from intracellular (inside the cell) pathogens?

• Passive

• Innate

• Humoral

• Cellular

B cells mature in the __________. T cells mature in the __________.

• bone marrow; bone marrow

• thymus; thymus

• bone marrow; thymus

• thymus; bone marrow

Which protein is used by cells to present antigens to T cells?

• BCR

• MHC

• Antibodies

• Allergens

What is the first step in B cell activation?

• B cell receptor binds to antigen

• B cell engulfs antigen

• B cell displays antigen on MHC and presents it to a helper T cell

• Helper T cell releases cytokines which stimulates the B cell to proliferate

Which type of cell secretes antibodies?

• Memory cell

• Helper T cell

• Cytotoxic T cell

• Plasma cell

Which part of an antibody has a unique shape enabling it to bind to its specific antigen?

• Constant region

• Variable region

• Cytokine

• MHC protein

Which class of antibody is the most abundant?

• IgG

• IgA

• IgM

• IgE